capturing output of command line in an array

amjadcsu at gmail.com amjadcsu at gmail.com
Wed Oct 31 23:20:56 CET 2007


Thanks Lee
I am looking to just get the node name from that info.
I dont need all other info
so my list would be just
alist=[node13,node12,node8,node1 ....]
is it possible??

On Oct 31, 9:44 am, Lee Capps <lca... at cteresource.org> wrote:
> On Oct 31, 2007, at 11:01 AM, amjad... at gmail.com wrote:
>
>
>
> > I am trying to execute a command using os.system. this command lists
> > the number of nodes alive in a cluster. I would like to capture the
> > output in list/array in python. IS it possible.?/
>
> > Here is my command
> >  gstat -a
> > node13     2 (    0/   56) [  0.00,  0.00,  0.00] [   0.0,   0.0,
> > 0.1,  99.9,   0.0] OFF
> > node12     2 (    1/   63) [  0.99,  0.97,  0.91] [  46.6,   0.0,
> > 3.7,  49.8,   0.0] OFF
> > node8     2 (    1/   59) [  0.99,  0.97,  0.91] [  47.5,   0.0,
> > 2.8,  49.7,   0.0] OFF
> > node2     2 (    1/   59) [  0.99,  0.97,  0.91] [  46.6,   0.0,
> > 3.7,  49.7,   0.0] OFF
> > node1     2 (    1/   59) [  0.99,  0.97,  0.91] [  46.6,   0.0,
> > 3.7,  49.7,   0.0] OFF
> > node7     2 (    1/   58) [  0.99,  0.97,  0.91] [  49.8,   0.0,
> > 0.6,  49.7,   0.0] OFF
> > node11     2 (    1/   59) [  0.99,  0.97,  0.91] [  46.6,   0.0,
> > 3.8,  49.6,   0.0] OFF
> > node4     2 (    1/   59) [  1.00,  1.00,  0.93] [  46.6,   0.0,
> > 3.7,  49.7,   0.0] OFF
> > node10     2 (    1/   59) [  1.00,  1.00,  0.94] [  46.7,   0.0,
> > 3.7,  49.7,   0.0] OFF
> > node5     2 (    1/   59) [  1.00,  1.00,  0.92] [  49.8,   0.0,
> > 0.4,  49.7,   0.0] OFF
> > node6     2 (    1/   59) [  1.00,  1.00,  0.94] [  49.5,   0.0,
> > 0.9,  49.7,   0.0] OFF
>
> > I would like to have an array where each element contains the nodes
>
> > for example
> > a=[node13,node12,node2,node8,node1,node7,node 11]
>
> > any help would be appreciated
>
> You might try os.popen to read in the output of your command.
>
> It would be helpful to have more information about what you'd like to
> do with your list.  Do you just want to put the text of the
> individual node lines from gstat into the list?  If so, os.popen
> should work for you.  Or  do you need to parse the lines and store
> them in, say dictionaries?  Tuples?  If you need to parse it, you
> could use module re, or even just string methods, depending on what
> you're trying to do . . . .
>
> HTH,
>
> ---
> Lee Capps
> Technology Specialist
> CTE Resource Center
> lca... at cteresource.org





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